Missing body parts when importing mhx in blender
This is what is expected when you export an .mhx from MakeHuman with clothing.  You need to deselect the options that hide the body parts under clothing in MakeHuman prior to export.

MakeHuman provides those options to reduce polygons/vertices that are not intended to ever be seen in a game, render, or animation.

Likewise, when importing an .mhx model in Blender, you are given options for hiding/showing various aspects of the model.  Just make sure your "hide vertices under clothing" options are set to be disabled in both programs.